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soundfont-player.js
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soundfont-player.js
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(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
'use strict'
var load = require('audio-loader')
var player = require('sample-player')
/**
* Load a soundfont instrument. It returns a promise that resolves to a
* instrument object.
*
* The instrument object returned by the promise has the following properties:
*
* - name: the instrument name
* - play: A function to play notes from the buffer with the signature
* `play(note, time, duration, options)`
*
*
* The valid options are:
*
* - `format`: the soundfont format. 'mp3' by default. Can be 'ogg'
* - `soundfont`: the soundfont name. 'MusyngKite' by default. Can be 'FluidR3_GM'
* - `nameToUrl` <Function>: a function to convert from instrument names to URL
* - `destination`: by default Soundfont uses the `audioContext.destination` but you can override it.
* - `gain`: the gain of the player (1 by default)
* - `notes`: an array of the notes to decode. It can be an array of strings
* with note names or an array of numbers with midi note numbers. This is a
* performance option: since decoding mp3 is a cpu intensive process, you can limit
* limit the number of notes you want and reduce the time to load the instrument.
*
* @param {AudioContext} ac - the audio context
* @param {String} name - the instrument name. For example: 'acoustic_grand_piano'
* @param {Object} options - (Optional) the same options as Soundfont.loadBuffers
* @return {Promise}
*
* @example
* var Soundfont = require('sounfont-player')
* Soundfont.instrument('marimba').then(function (marimba) {
* marimba.play('C4')
* })
*/
function instrument (ac, name, options) {
if (arguments.length === 1) return function (n, o) { return instrument(ac, n, o) }
var opts = options || {}
var isUrl = opts.isSoundfontURL || isSoundfontURL
var toUrl = opts.nameToUrl || nameToUrl
var url = isUrl(name) ? name : toUrl(name, opts.soundfont, opts.format)
return load(ac, url, { only: opts.only || opts.notes }).then(function (buffers) {
var p = player(ac, buffers, opts).connect(ac.destination)
p.url = url
p.name = name
return p
})
}
function isSoundfontURL (name) {
return /\.js(\?.*)?$/i.test(name)
}
/**
* Given an instrument name returns a URL to to the Benjamin Gleitzman's
* package of [pre-rendered sound fonts](https://github.com/gleitz/midi-js-soundfonts)
*
* @param {String} name - instrument name
* @param {String} soundfont - (Optional) the soundfont name. One of 'FluidR3_GM'
* or 'MusyngKite' ('MusyngKite' by default)
* @param {String} format - (Optional) Can be 'mp3' or 'ogg' (mp3 by default)
* @returns {String} the Soundfont file url
* @example
* var Soundfont = require('soundfont-player')
* Soundfont.nameToUrl('marimba', 'mp3')
*/
function nameToUrl (name, sf, format) {
format = format === 'ogg' ? format : 'mp3'
sf = sf === 'FluidR3_GM' ? sf : 'MusyngKite'
return 'https://gleitz.github.io/midi-js-soundfonts/' + sf + '/' + name + '-' + format + '.js'
}
// In the 1.0.0 release it will be:
// var Soundfont = {}
var Soundfont = require('./legacy')
Soundfont.instrument = instrument
Soundfont.nameToUrl = nameToUrl
if (typeof module === 'object' && module.exports) module.exports = Soundfont
if (typeof window !== 'undefined') window.Soundfont = Soundfont
},{"./legacy":2,"audio-loader":6,"sample-player":10}],2:[function(require,module,exports){
'use strict'
var parser = require('note-parser')
/**
* Create a Soundfont object
*
* @param {AudioContext} context - the [audio context](https://developer.mozilla.org/en/docs/Web/API/AudioContext)
* @param {Function} nameToUrl - (Optional) a function that maps the sound font name to the url
* @return {Soundfont} a soundfont object
*/
function Soundfont (ctx, nameToUrl) {
console.warn('new Soundfont() is deprected')
console.log('Please use Soundfont.instrument() instead of new Soundfont().instrument()')
if (!(this instanceof Soundfont)) return new Soundfont(ctx)
this.nameToUrl = nameToUrl || Soundfont.nameToUrl
this.ctx = ctx
this.instruments = {}
this.promises = []
}
Soundfont.prototype.onready = function (callback) {
console.warn('deprecated API')
console.log('Please use Promise.all(Soundfont.instrument(), Soundfont.instrument()).then() instead of new Soundfont().onready()')
Promise.all(this.promises).then(callback)
}
Soundfont.prototype.instrument = function (name, options) {
console.warn('new Soundfont().instrument() is deprecated.')
console.log('Please use Soundfont.instrument() instead.')
var ctx = this.ctx
name = name || 'default'
if (name in this.instruments) return this.instruments[name]
var inst = {name: name, play: oscillatorPlayer(ctx, options)}
this.instruments[name] = inst
if (name !== 'default') {
var promise = Soundfont.instrument(ctx, name, options).then(function (instrument) {
inst.play = instrument.play
return inst
})
this.promises.push(promise)
inst.onready = function (cb) {
console.warn('onready is deprecated. Use Soundfont.instrument().then()')
promise.then(cb)
}
} else {
inst.onready = function (cb) {
console.warn('onready is deprecated. Use Soundfont.instrument().then()')
cb()
}
}
return inst
}
/*
* Load the buffers of a given instrument name. It returns a promise that resolves
* to a hash with midi note numbers as keys, and audio buffers as values.
*
* @param {AudioContext} ac - the audio context
* @param {String} name - the instrument name (it accepts an url if starts with "http")
* @param {Object} options - (Optional) options object
* @return {Promise} a promise that resolves to a Hash of { midiNoteNum: <AudioBuffer> }
*
* The options object accepts the following keys:
*
* - nameToUrl {Function}: a function to convert from instrument names to urls.
* By default it uses Benjamin Gleitzman's package of
* [pre-rendered sound fonts](https://github.com/gleitz/midi-js-soundfonts)
* - notes {Array}: the list of note names to be decoded (all by default)
*
* @example
* var Soundfont = require('soundfont-player')
* Soundfont.loadBuffers(ctx, 'acoustic_grand_piano').then(function(buffers) {
* buffers[60] // => An <AudioBuffer> corresponding to note C4
* })
*/
function loadBuffers (ac, name, options) {
console.warn('Soundfont.loadBuffers is deprecate.')
console.log('Use Soundfont.instrument(..) and get buffers properties from the result.')
return Soundfont.instrument(ac, name, options).then(function (inst) {
return inst.buffers
})
}
Soundfont.loadBuffers = loadBuffers
/**
* Returns a function that plays an oscillator
*
* @param {AudioContext} ac - the audio context
* @param {Hash} defaultOptions - (Optional) a hash of options:
* - vcoType: the oscillator type (default: 'sine')
* - gain: the output gain value (default: 0.4)
* - destination: the player destination (default: ac.destination)
*/
function oscillatorPlayer (ctx, defaultOptions) {
defaultOptions = defaultOptions || {}
return function (note, time, duration, options) {
console.warn('The oscillator player is deprecated.')
console.log('Starting with version 0.9.0 you will have to wait until the soundfont is loaded to play sounds.')
var midi = note > 0 && note < 129 ? +note : parser.midi(note)
var freq = midi ? parser.midiToFreq(midi, 440) : null
if (!freq) return
duration = duration || 0.2
options = options || {}
var destination = options.destination || defaultOptions.destination || ctx.destination
var vcoType = options.vcoType || defaultOptions.vcoType || 'sine'
var gain = options.gain || defaultOptions.gain || 0.4
var vco = ctx.createOscillator()
vco.type = vcoType
vco.frequency.value = freq
/* VCA */
var vca = ctx.createGain()
vca.gain.value = gain
/* Connections */
vco.connect(vca)
vca.connect(destination)
vco.start(time)
if (duration > 0) vco.stop(time + duration)
return vco
}
}
/**
* Given a note name, return the note midi number
*
* @name noteToMidi
* @function
* @param {String} noteName
* @return {Integer} the note midi number or null if not a valid note name
*/
Soundfont.noteToMidi = parser.midi
module.exports = Soundfont
},{"note-parser":8}],3:[function(require,module,exports){
module.exports = ADSR
function ADSR(audioContext){
var node = audioContext.createGain()
var voltage = node._voltage = getVoltage(audioContext)
var value = scale(voltage)
var startValue = scale(voltage)
var endValue = scale(voltage)
node._startAmount = scale(startValue)
node._endAmount = scale(endValue)
node._multiplier = scale(value)
node._multiplier.connect(node)
node._startAmount.connect(node)
node._endAmount.connect(node)
node.value = value.gain
node.startValue = startValue.gain
node.endValue = endValue.gain
node.startValue.value = 0
node.endValue.value = 0
Object.defineProperties(node, props)
return node
}
var props = {
attack: { value: 0, writable: true },
decay: { value: 0, writable: true },
sustain: { value: 1, writable: true },
release: {value: 0, writable: true },
getReleaseDuration: {
value: function(){
return this.release
}
},
start: {
value: function(at){
var target = this._multiplier.gain
var startAmount = this._startAmount.gain
var endAmount = this._endAmount.gain
this._voltage.start(at)
this._decayFrom = this._decayFrom = at+this.attack
this._startedAt = at
var sustain = this.sustain
target.cancelScheduledValues(at)
startAmount.cancelScheduledValues(at)
endAmount.cancelScheduledValues(at)
endAmount.setValueAtTime(0, at)
if (this.attack){
target.setValueAtTime(0, at)
target.linearRampToValueAtTime(1, at + this.attack)
startAmount.setValueAtTime(1, at)
startAmount.linearRampToValueAtTime(0, at + this.attack)
} else {
target.setValueAtTime(1, at)
startAmount.setValueAtTime(0, at)
}
if (this.decay){
target.setTargetAtTime(sustain, this._decayFrom, getTimeConstant(this.decay))
}
}
},
stop: {
value: function(at, isTarget){
if (isTarget){
at = at - this.release
}
var endTime = at + this.release
if (this.release){
var target = this._multiplier.gain
var startAmount = this._startAmount.gain
var endAmount = this._endAmount.gain
target.cancelScheduledValues(at)
startAmount.cancelScheduledValues(at)
endAmount.cancelScheduledValues(at)
var expFalloff = getTimeConstant(this.release)
// truncate attack (required as linearRamp is removed by cancelScheduledValues)
if (this.attack && at < this._decayFrom){
var valueAtTime = getValue(0, 1, this._startedAt, this._decayFrom, at)
target.linearRampToValueAtTime(valueAtTime, at)
startAmount.linearRampToValueAtTime(1-valueAtTime, at)
startAmount.setTargetAtTime(0, at, expFalloff)
}
endAmount.setTargetAtTime(1, at, expFalloff)
target.setTargetAtTime(0, at, expFalloff)
}
this._voltage.stop(endTime)
return endTime
}
},
onended: {
get: function(){
return this._voltage.onended
},
set: function(value){
this._voltage.onended = value
}
}
}
var flat = new Float32Array([1,1])
function getVoltage(context){
var voltage = context.createBufferSource()
var buffer = context.createBuffer(1, 2, context.sampleRate)
buffer.getChannelData(0).set(flat)
voltage.buffer = buffer
voltage.loop = true
return voltage
}
function scale(node){
var gain = node.context.createGain()
node.connect(gain)
return gain
}
function getTimeConstant(time){
return Math.log(time+1)/Math.log(100)
}
function getValue(start, end, fromTime, toTime, at){
var difference = end - start
var time = toTime - fromTime
var truncateTime = at - fromTime
var phase = truncateTime / time
var value = start + phase * difference
if (value <= start) {
value = start
}
if (value >= end) {
value = end
}
return value
}
},{}],4:[function(require,module,exports){
'use strict'
// DECODE UTILITIES
function b64ToUint6 (nChr) {
return nChr > 64 && nChr < 91 ? nChr - 65
: nChr > 96 && nChr < 123 ? nChr - 71
: nChr > 47 && nChr < 58 ? nChr + 4
: nChr === 43 ? 62
: nChr === 47 ? 63
: 0
}
// Decode Base64 to Uint8Array
// ---------------------------
function decode (sBase64, nBlocksSize) {
var sB64Enc = sBase64.replace(/[^A-Za-z0-9\+\/]/g, '')
var nInLen = sB64Enc.length
var nOutLen = nBlocksSize
? Math.ceil((nInLen * 3 + 1 >> 2) / nBlocksSize) * nBlocksSize
: nInLen * 3 + 1 >> 2
var taBytes = new Uint8Array(nOutLen)
for (var nMod3, nMod4, nUint24 = 0, nOutIdx = 0, nInIdx = 0; nInIdx < nInLen; nInIdx++) {
nMod4 = nInIdx & 3
nUint24 |= b64ToUint6(sB64Enc.charCodeAt(nInIdx)) << 18 - 6 * nMod4
if (nMod4 === 3 || nInLen - nInIdx === 1) {
for (nMod3 = 0; nMod3 < 3 && nOutIdx < nOutLen; nMod3++, nOutIdx++) {
taBytes[nOutIdx] = nUint24 >>> (16 >>> nMod3 & 24) & 255
}
nUint24 = 0
}
}
return taBytes
}
module.exports = { decode: decode }
},{}],5:[function(require,module,exports){
/* global XMLHttpRequest */
'use strict'
/**
* Given a url and a return type, returns a promise to the content of the url
* Basically it wraps a XMLHttpRequest into a Promise
*
* @param {String} url
* @param {String} type - can be 'text' or 'arraybuffer'
* @return {Promise}
*/
module.exports = function (url, type) {
return new Promise(function (done, reject) {
var req = new XMLHttpRequest()
if (type) req.responseType = type
req.open('GET', url)
req.onload = function () {
req.status === 200 ? done(req.response) : reject(Error(req.statusText))
}
req.onerror = function () { reject(Error('Network Error')) }
req.send()
})
}
},{}],6:[function(require,module,exports){
'use strict'
var base64 = require('./base64')
var fetch = require('./fetch')
// Given a regex, return a function that test if against a string
function fromRegex (r) {
return function (o) { return typeof o === 'string' && r.test(o) }
}
// Try to apply a prefix to a name
function prefix (pre, name) {
return typeof pre === 'string' ? pre + name
: typeof pre === 'function' ? pre(name)
: name
}
/**
* Load one or more audio files
*
*
* Possible option keys:
*
* - __from__ {Function|String}: a function or string to convert from file names to urls.
* If is a string it will be prefixed to the name:
* `load(ac, 'snare.mp3', { from: 'http://audio.net/samples/' })`
* If it's a function it receives the file name and should return the url as string.
* - __only__ {Array} - when loading objects, if provided, only the given keys
* will be included in the decoded object:
* `load(ac, 'piano.json', { only: ['C2', 'D2'] })`
*
* @param {AudioContext} ac - the audio context
* @param {Object} source - the object to be loaded
* @param {Object} options - (Optional) the load options for that object
* @param {Object} defaultValue - (Optional) the default value to return as
* in a promise if not valid loader found
*/
function load (ac, source, options, defVal) {
var loader =
// Basic audio loading
isArrayBuffer(source) ? loadArrayBuffer
: isAudioFileName(source) ? loadAudioFile
: isPromise(source) ? loadPromise
// Compound objects
: isArray(source) ? loadArrayData
: isObject(source) ? loadObjectData
: isJsonFileName(source) ? loadJsonFile
// Base64 encoded audio
: isBase64Audio(source) ? loadBase64Audio
: isJsFileName(source) ? loadMidiJSFile
: null
var opts = options || {}
return loader ? loader(ac, source, opts)
: defVal ? Promise.resolve(defVal)
: Promise.reject('Source not valid (' + source + ')')
}
load.fetch = fetch
// BASIC AUDIO LOADING
// ===================
// Load (decode) an array buffer
function isArrayBuffer (o) { return o instanceof ArrayBuffer }
function loadArrayBuffer (ac, array, options) {
return new Promise(function (done, reject) {
ac.decodeAudioData(array,
function (buffer) { done(buffer) },
function () { reject("Can't decode audio data (" + array.slice(0, 30) + '...)') }
)
})
}
// Load an audio filename
var isAudioFileName = fromRegex(/\.(mp3|wav|ogg)(\?.*)?$/i)
function loadAudioFile (ac, name, options) {
var url = prefix(options.from, name)
return load(ac, load.fetch(url, 'arraybuffer'), options)
}
// Load the result of a promise
function isPromise (o) { return o && typeof o.then === 'function' }
function loadPromise (ac, promise, options) {
return promise.then(function (value) {
return load(ac, value, options)
})
}
// COMPOUND OBJECTS
// ================
// Try to load all the items of an array
var isArray = Array.isArray
function loadArrayData (ac, array, options) {
return Promise.all(array.map(function (data) {
return load(ac, data, options, data)
}))
}
// Try to load all the values of a key/value object
function isObject (o) { return o && typeof o === 'object' }
function loadObjectData (ac, obj, options) {
var dest = {}
var promises = Object.keys(obj).map(function (key) {
if (options.only && options.only.indexOf(key) === -1) return null
var value = obj[key]
return load(ac, value, options, value).then(function (audio) {
dest[key] = audio
})
})
return Promise.all(promises).then(function () { return dest })
}
// Load the content of a JSON file
var isJsonFileName = fromRegex(/\.json(\?.*)?$/i)
function loadJsonFile (ac, name, options) {
var url = prefix(options.from, name)
return load(ac, load.fetch(url, 'text').then(JSON.parse), options)
}
// BASE64 ENCODED FORMATS
// ======================
// Load strings with Base64 encoded audio
var isBase64Audio = fromRegex(/^data:audio/)
function loadBase64Audio (ac, source, options) {
var i = source.indexOf(',')
return load(ac, base64.decode(source.slice(i + 1)).buffer, options)
}
// Load .js files with MidiJS soundfont prerendered audio
var isJsFileName = fromRegex(/\.js(\?.*)?$/i)
function loadMidiJSFile (ac, name, options) {
var url = prefix(options.from, name)
return load(ac, load.fetch(url, 'text').then(midiJsToJson), options)
}
// convert a MIDI.js javascript soundfont file to json
function midiJsToJson (data) {
var begin = data.indexOf('MIDI.Soundfont.')
if (begin < 0) throw Error('Invalid MIDI.js Soundfont format')
begin = data.indexOf('=', begin) + 2
var end = data.lastIndexOf(',')
return JSON.parse(data.slice(begin, end) + '}')
}
if (typeof module === 'object' && module.exports) module.exports = load
if (typeof window !== 'undefined') window.loadAudio = load
},{"./base64":4,"./fetch":5}],7:[function(require,module,exports){
(function (global){
(function(e){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=e()}else if(typeof define==="function"&&define.amd){define([],e)}else{var t;if(typeof window!=="undefined"){t=window}else if(typeof global!=="undefined"){t=global}else if(typeof self!=="undefined"){t=self}else{t=this}t.midimessage=e()}})(function(){var e,t,s;return function o(e,t,s){function a(n,i){if(!t[n]){if(!e[n]){var l=typeof require=="function"&&require;if(!i&&l)return l(n,!0);if(r)return r(n,!0);var h=new Error("Cannot find module '"+n+"'");throw h.code="MODULE_NOT_FOUND",h}var c=t[n]={exports:{}};e[n][0].call(c.exports,function(t){var s=e[n][1][t];return a(s?s:t)},c,c.exports,o,e,t,s)}return t[n].exports}var r=typeof require=="function"&&require;for(var n=0;n<s.length;n++)a(s[n]);return a}({1:[function(e,t,s){"use strict";Object.defineProperty(s,"__esModule",{value:true});s["default"]=function(e){function t(e){this._event=e;this._data=e.data;this.receivedTime=e.receivedTime;if(this._data&&this._data.length<2){console.warn("Illegal MIDI message of length",this._data.length);return}this._messageCode=e.data[0]&240;this.channel=e.data[0]&15;switch(this._messageCode){case 128:this.messageType="noteoff";this.key=e.data[1]&127;this.velocity=e.data[2]&127;break;case 144:this.messageType="noteon";this.key=e.data[1]&127;this.velocity=e.data[2]&127;break;case 160:this.messageType="keypressure";this.key=e.data[1]&127;this.pressure=e.data[2]&127;break;case 176:this.messageType="controlchange";this.controllerNumber=e.data[1]&127;this.controllerValue=e.data[2]&127;if(this.controllerNumber===120&&this.controllerValue===0){this.channelModeMessage="allsoundoff"}else if(this.controllerNumber===121){this.channelModeMessage="resetallcontrollers"}else if(this.controllerNumber===122){if(this.controllerValue===0){this.channelModeMessage="localcontroloff"}else{this.channelModeMessage="localcontrolon"}}else if(this.controllerNumber===123&&this.controllerValue===0){this.channelModeMessage="allnotesoff"}else if(this.controllerNumber===124&&this.controllerValue===0){this.channelModeMessage="omnimodeoff"}else if(this.controllerNumber===125&&this.controllerValue===0){this.channelModeMessage="omnimodeon"}else if(this.controllerNumber===126){this.channelModeMessage="monomodeon"}else if(this.controllerNumber===127){this.channelModeMessage="polymodeon"}break;case 192:this.messageType="programchange";this.program=e.data[1];break;case 208:this.messageType="channelpressure";this.pressure=e.data[1]&127;break;case 224:this.messageType="pitchbendchange";var t=e.data[2]&127;var s=e.data[1]&127;this.pitchBend=(t<<8)+s;break}}return new t(e)};t.exports=s["default"]},{}]},{},[1])(1)});
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],8:[function(require,module,exports){
!function(t,n){"object"==typeof exports&&"undefined"!=typeof module?n(exports):"function"==typeof define&&define.amd?define(["exports"],n):n(t.NoteParser=t.NoteParser||{})}(this,function(t){"use strict";function n(t,n){return Array(n+1).join(t)}function r(t){return"number"==typeof t}function e(t){return"string"==typeof t}function u(t){return void 0!==t}function c(t,n){return Math.pow(2,(t-69)/12)*(n||440)}function o(){return b}function i(t,n,r){if("string"!=typeof t)return null;var e=b.exec(t);if(!e||!n&&e[4])return null;var u={letter:e[1].toUpperCase(),acc:e[2].replace(/x/g,"##")};u.pc=u.letter+u.acc,u.step=(u.letter.charCodeAt(0)+3)%7,u.alt="b"===u.acc[0]?-u.acc.length:u.acc.length;var o=A[u.step]+u.alt;return u.chroma=o<0?12+o:o%12,e[3]&&(u.oct=+e[3],u.midi=o+12*(u.oct+1),u.freq=c(u.midi,r)),n&&(u.tonicOf=e[4]),u}function f(t){return r(t)?t<0?n("b",-t):n("#",t):""}function a(t){return r(t)?""+t:""}function l(t,n,r){return null===t||void 0===t?null:t.step?l(t.step,t.alt,t.oct):t<0||t>6?null:C.charAt(t)+f(n)+a(r)}function p(t){if((r(t)||e(t))&&t>=0&&t<128)return+t;var n=i(t);return n&&u(n.midi)?n.midi:null}function s(t,n){var r=p(t);return null===r?null:c(r,n)}function d(t){return(i(t)||{}).letter}function m(t){return(i(t)||{}).acc}function h(t){return(i(t)||{}).pc}function v(t){return(i(t)||{}).step}function g(t){return(i(t)||{}).alt}function x(t){return(i(t)||{}).chroma}function y(t){return(i(t)||{}).oct}var b=/^([a-gA-G])(#{1,}|b{1,}|x{1,}|)(-?\d*)\s*(.*)\s*$/,A=[0,2,4,5,7,9,11],C="CDEFGAB";t.regex=o,t.parse=i,t.build=l,t.midi=p,t.freq=s,t.letter=d,t.acc=m,t.pc=h,t.step=v,t.alt=g,t.chroma=x,t.oct=y});
},{}],9:[function(require,module,exports){
module.exports = function (player) {
/**
* Adds a listener of an event
* @chainable
* @param {String} event - the event name
* @param {Function} callback - the event handler
* @return {SamplePlayer} the player
* @example
* player.on('start', function(time, note) {
* console.log(time, note)
* })
*/
player.on = function (event, cb) {
if (arguments.length === 1 && typeof event === 'function') return player.on('event', event)
var prop = 'on' + event
var old = player[prop]
player[prop] = old ? chain(old, cb) : cb
return player
}
return player
}
function chain (fn1, fn2) {
return function (a, b, c, d) { fn1(a, b, c, d); fn2(a, b, c, d) }
}
},{}],10:[function(require,module,exports){
'use strict'
var player = require('./player')
var events = require('./events')
var notes = require('./notes')
var scheduler = require('./scheduler')
var midi = require('./midi')
function SamplePlayer (ac, source, options) {
return midi(scheduler(notes(events(player(ac, source, options)))))
}
if (typeof module === 'object' && module.exports) module.exports = SamplePlayer
if (typeof window !== 'undefined') window.SamplePlayer = SamplePlayer
},{"./events":9,"./midi":11,"./notes":12,"./player":13,"./scheduler":14}],11:[function(require,module,exports){
var midimessage = require('midimessage')
module.exports = function (player) {
/**
* Connect a player to a midi input
*
* The options accepts:
*
* - channel: the channel to listen to. Listen to all channels by default.
*
* @param {MIDIInput} input
* @param {Object} options - (Optional)
* @return {SamplePlayer} the player
* @example
* var piano = player(...)
* window.navigator.requestMIDIAccess().then(function (midiAccess) {
* midiAccess.inputs.forEach(function (midiInput) {
* piano.listenToMidi(midiInput)
* })
* })
*/
player.listenToMidi = function (input, options) {
var started = {}
var opts = options || {}
var gain = opts.gain || function (vel) { return vel / 127 }
input.onmidimessage = function (msg) {
var mm = msg.messageType ? msg : midimessage(msg)
if (mm.messageType === 'noteon' && mm.velocity === 0) {
mm.messageType = 'noteoff'
}
if (opts.channel && mm.channel !== opts.channel) return
switch (mm.messageType) {
case 'noteon':
started[mm.key] = player.play(mm.key, 0, { gain: gain(mm.velocity) })
break
case 'noteoff':
if (started[mm.key]) {
started[mm.key].stop()
delete started[mm.key]
}
break
}
}
return player
}
return player
}
},{"midimessage":7}],12:[function(require,module,exports){
'use strict'
var note = require('note-parser')
var isMidi = function (n) { return n !== null && n !== [] && n >= 0 && n < 129 }
var toMidi = function (n) { return isMidi(n) ? +n : note.midi(n) }
// Adds note name to midi conversion
module.exports = function (player) {
if (player.buffers) {
var map = player.opts.map
var toKey = typeof map === 'function' ? map : toMidi
var mapper = function (name) {
return name ? toKey(name) || name : null
}
player.buffers = mapBuffers(player.buffers, mapper)
var start = player.start
player.start = function (name, when, options) {
var key = mapper(name)
var dec = key % 1
if (dec) {
key = Math.floor(key)
options = Object.assign(options || {}, { cents: Math.floor(dec * 100) })
}
return start(key, when, options)
}
}
return player
}
function mapBuffers (buffers, toKey) {
return Object.keys(buffers).reduce(function (mapped, name) {
mapped[toKey(name)] = buffers[name]
return mapped
}, {})
}
},{"note-parser":15}],13:[function(require,module,exports){
/* global AudioBuffer */
'use strict'
var ADSR = require('adsr')
var EMPTY = {}
var DEFAULTS = {
gain: 1,
attack: 0.01,
decay: 0.1,
sustain: 0.9,
release: 0.3,
loop: false,
cents: 0,
loopStart: 0,
loopEnd: 0
}
/**
* Create a sample player.
*
* @param {AudioContext} ac - the audio context
* @param {ArrayBuffer|Object<String,ArrayBuffer>} source
* @param {Onject} options - (Optional) an options object
* @return {player} the player
* @example
* var SamplePlayer = require('sample-player')
* var ac = new AudioContext()
* var snare = SamplePlayer(ac, <AudioBuffer>)
* snare.play()
*/
function SamplePlayer (ac, source, options) {
var connected = false
var nextId = 0
var tracked = {}
var out = ac.createGain()
out.gain.value = 1
var opts = Object.assign({}, DEFAULTS, options)
/**
* @namespace
*/
var player = { context: ac, out: out, opts: opts }
if (source instanceof AudioBuffer) player.buffer = source
else player.buffers = source
/**
* Start a sample buffer.
*
* The returned object has a function `stop(when)` to stop the sound.
*
* @param {String} name - the name of the buffer. If the source of the
* SamplePlayer is one sample buffer, this parameter is not required
* @param {Float} when - (Optional) when to start (current time if by default)
* @param {Object} options - additional sample playing options
* @return {AudioNode} an audio node with a `stop` function
* @example
* var sample = player(ac, <AudioBuffer>).connect(ac.destination)
* sample.start()
* sample.start(5, { gain: 0.7 }) // name not required since is only one AudioBuffer
* @example
* var drums = player(ac, { snare: <AudioBuffer>, kick: <AudioBuffer>, ... }).connect(ac.destination)
* drums.start('snare')
* drums.start('snare', 0, { gain: 0.3 })
*/
player.start = function (name, when, options) {
// if only one buffer, reorder arguments
if (player.buffer && name !== null) return player.start(null, name, when)
var buffer = name ? player.buffers[name] : player.buffer
if (!buffer) {
console.warn('Buffer ' + name + ' not found.')
return
} else if (!connected) {
console.warn('SamplePlayer not connected to any node.')
return
}
var opts = options || EMPTY
when = Math.max(ac.currentTime, when || 0)
player.emit('start', when, name, opts)
var node = createNode(name, buffer, opts)
node.id = track(name, node)
node.env.start(when)
node.source.start(when)
player.emit('started', when, node.id, node)
if (opts.duration) node.stop(when + opts.duration)
return node
}
// NOTE: start will be override so we can't copy the function reference
// this is obviously not a good design, so this code will be gone soon.
/**
* An alias for `player.start`
* @see player.start
* @since 0.3.0
*/
player.play = function (name, when, options) {
return player.start(name, when, options)
}
/**
* Stop some or all samples
*
* @param {Float} when - (Optional) an absolute time in seconds (or currentTime
* if not specified)
* @param {Array} nodes - (Optional) an array of nodes or nodes ids to stop
* @return {Array} an array of ids of the stoped samples
*
* @example
* var longSound = player(ac, <AudioBuffer>).connect(ac.destination)
* longSound.start(ac.currentTime)
* longSound.start(ac.currentTime + 1)
* longSound.start(ac.currentTime + 2)
* longSound.stop(ac.currentTime + 3) // stop the three sounds
*/
player.stop = function (when, ids) {
var node
ids = ids || Object.keys(tracked)
return ids.map(function (id) {
node = tracked[id]
if (!node) return null
node.stop(when)
return node.id
})
}
/**
* Connect the player to a destination node
*
* @param {AudioNode} destination - the destination node
* @return {AudioPlayer} the player
* @chainable
* @example
* var sample = player(ac, <AudioBuffer>).connect(ac.destination)
*/
player.connect = function (dest) {
connected = true
out.connect(dest)
return player
}
player.emit = function (event, when, obj, opts) {
if (player.onevent) player.onevent(event, when, obj, opts)
var fn = player['on' + event]
if (fn) fn(when, obj, opts)
}
return player
// =============== PRIVATE FUNCTIONS ============== //
function track (name, node) {
node.id = nextId++
tracked[node.id] = node
node.source.onended = function () {
var now = ac.currentTime
node.source.disconnect()
node.env.disconnect()
node.disconnect()
player.emit('ended', now, node.id, node)
}
return node.id
}
function createNode (name, buffer, options) {
var node = ac.createGain()
node.gain.value = 0 // the envelope will control the gain
node.connect(out)
node.env = envelope(ac, options, opts)
node.env.connect(node.gain)
node.source = ac.createBufferSource()
node.source.buffer = buffer
node.source.connect(node)
node.source.loop = options.loop || opts.loop
node.source.playbackRate.value = centsToRate(options.cents || opts.cents)
node.source.loopStart = options.loopStart || opts.loopStart
node.source.loopEnd = options.loopEnd || opts.loopEnd
node.stop = function (when) {
var time = when || ac.currentTime
player.emit('stop', time, name)
var stopAt = node.env.stop(time)
node.source.stop(stopAt)
}
return node
}
}
function isNum (x) { return typeof x === 'number' }
var PARAMS = ['attack', 'decay', 'sustain', 'release']
function envelope (ac, options, opts) {
var env = ADSR(ac)
var adsr = options.adsr || opts.adsr
PARAMS.forEach(function (name, i) {
if (adsr) env[name] = adsr[i]
else env[name] = options[name] || opts[name]
})
env.value.value = isNum(options.gain) ? options.gain
: isNum(opts.gain) ? opts.gain : 1
return env
}
/*
* Get playback rate for a given pitch change (in cents)
* Basic [math](http://www.birdsoft.demon.co.uk/music/samplert.htm):
* f2 = f1 * 2^( C / 1200 )
*/
function centsToRate (cents) { return cents ? Math.pow(2, cents / 1200) : 1 }
module.exports = SamplePlayer
},{"adsr":3}],14:[function(require,module,exports){
'use strict'
var isArr = Array.isArray
var isObj = function (o) { return o && typeof o === 'object' }
var OPTS = {}
module.exports = function (player) {
/**
* Schedule a list of events to be played at specific time.
*
* It supports three formats of events for the events list:
*
* - An array with [time, note]
* - An array with [time, object]
* - An object with { time: ?, [name|note|midi|key]: ? }
*
* @param {Float} time - an absolute time to start (or AudioContext's
* currentTime if provided number is 0)
* @param {Array} events - the events list.
* @return {Array} an array of ids
*
* @example
* // Event format: [time, note]
* var piano = player(ac, ...).connect(ac.destination)
* piano.schedule(0, [ [0, 'C2'], [0.5, 'C3'], [1, 'C4'] ])
*
* @example
* // Event format: an object { time: ?, name: ? }
* var drums = player(ac, ...).connect(ac.destination)
* drums.schedule(0, [
* { name: 'kick', time: 0 },
* { name: 'snare', time: 0.5 },
* { name: 'kick', time: 1 },
* { name: 'snare', time: 1.5 }
* ])
*/
player.schedule = function (time, events) {
var now = player.context.currentTime
var when = time < now ? now : time